502 Gateway

After installing the latest Version 4.6.0?of the premium plugin and removing the Woocommerce add on as instructed in other forum topics things seem to work reasonably well. However performing a general search in the search field for the log viewer results in a 502 gateway error after about 3- 4 minutes of the page spinning. There is no log in the site logs as to why. The only other thing done at the same time is Wordfence was installed however we have done a conflict checker against Wordfence and the plugin performs the same way whether or not Wordfence is installed.